Prepare and chill this colorful salad up to three hours ahead. Lightly dress and toss greens right before serving. Use Valencia oranges; they're both sweet and tart with an intense citrus flavor.
Combine first 4 ingredients in a salad bowl.
Combine lime juice and next 5 ingredients in a small bowl; slowly add oil in a thin stream, whisking constantly. Drizzle dressing over salad; sprinkle with minced mint, and toss. Top with mint leaves.
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